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System Design
High-level system design, one everyday scene at a time: 30 concepts and 15 interview rounds.
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JSON Formatter
Format, validate and minify JSON.
Regex Tester
Test patterns against live text.
Merge PDF
Combine PDFs in your browser.
JWT Decoder
Read a token’s header and claims.
Password Generator
Strong passwords, generated locally.
Gradient Generator
Build CSS gradients visually.
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Devdle
One developer word a day, six guesses.
Python Rush
Classic snake, with coding icons to eat.
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A quick test of your reflexes.
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